<html>
  <head>
    <link wicket:id="css" src="myStyle.css"/>
  </head>
  <body>
    111<span wicket:id="label1">base label 1</span>222
    <wicket:child><wicket:extend>
   888<span wicket:id="label3">extension label</span>999
</wicket:extend></wicket:child>
    333<span wicket:id="label2">base label 2</span>444
  </body>
</html>
